Huntalot.com not supplying paid for goods

I ordered a sight, which the webpage showed 1 in stock, and paid for it in full. The following day I received an email stating that the sight is out of stock and that in 10 days time they would be “able to give an update when we will be able to bring in more” Going back onto the webpage it still shows the sight in stock.

I have emailed and tried calling Huntalot.com in order to obtain a refund and they are not replying to my emails or answering the phone.

It is unacceptable to show an item in stock, take full payment via credit card for it, and then not to have it in stock and to give a vague response as to when they would be able to supply it.